I am brand new to MMM and am only now developing any sort of idea of what my spending is, although I have never lived beyond my means (aside from student loans in college, I suppose), and have always maxed my 401K.
I started looking at the spending section of personalcapital.com to get a rough idea of my spending. After I taught it that Vanguard purchases aren't "expenses", and disregarded my one-off wedding and capital assessment in my condo, personal capital was saying I was spending ~70K/yearly. Not mustachian, but it includes my special needs dog (~7K a year),subsidization of my husband, who earns much less, and living in Manhattan with a professional, suit-requiring job.
I just took a closer look and realized that personal capital was counting my temporary 401K loan repayment and my HELOC repayment as spending. I mean, of course it is. That's debt that I took on to avoid signing on to a new secured loan for my capital assessment in my condo building, and is a one off thing that will be paid off in <2 years (could nearly pay it off now).
ETA: I knew I missed something! I forgot to take taxes out. so it's ~74% savings rate on post-tax income. Still exciting.
So, disregarding the once in a life time expenses but keeping my subsidization of dog and husband, I am spending ~45K a year (~25K of which is my mortgage and maintenance). Post-tax income is a wildcard because I got married, but assuming last year's effective rate (~29%), I'm living off of ~20% of my income by preliminary estimates. Holy crap, unless my back of the envelope is way off, I have a 80% savings rate.